Sending Email from an ASP.NET Web Pages

In Web Config

 <system.net>
    <mailSettings>
      <smtp from="XXXXX@gmail.com">
        <network host="smtp.gmail.com" port="587" userName="XXXX@gmail.com" password="XXX"                  defaultCredentials="false" />
      </smtp>
    </mailSettings>
  </system.net>

In C#

        System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient();
        System.Net.Mail.MailMessage smail = new System.Net.Mail.MailMessage();
         smail.Subject = "Subject of the Mail";
        smail.Body = "Body of the Mail";
        smail.To.Add("YYYYYY@gmail.com"); // or smail.To.Add(Textbox.Text);
        smail.From = new System.Net.Mail.MailAddress("XXXX@gmail.com");
        smail.IsBodyHtml = true;
        smtp.EnableSsl = true;
        smtp.Send(smail);